Steam-jet blower for furnaces



(No Model.) 3 SheetsSheet 1. W. MGOLAVE.

STEAM JET BLOWER FOR FURNAGBS.

No. 467,427. Patented Jan. 19, 1892.

Lil]! EEEEE 3 Sheets-Sheet 2.

(NoModeL) W. McCLAVE. STEAM JET BLOWER EOE FURNACES.

No. 467,427. Patented Jan. '19-, 1892.

THE moms PETERS cc., PHDTO LIYHD wnsnmsfuu, n. cy

3 Sheets-Sheet 3.

(No Mudel.)

W McGLAVE STEAM JET BLOWER FOR FURNACES.

No. 467,427. Patented Janhl9, 1892.

wTl'iE ToaZZ 1072,0722 it may concern.-

UNITED STATES PATENT OFFICE.

lVILLIAM MCCLAVE, OF SCRANTON, PENNSYLVANIA.

STEAM-JE T BLOWER FOR FURNACES.

SPECIFICATION forming part of Letters Patent No. 467,427, dated January19, 1892; Application filed October 28, 1891. Serial No. 410,074. (Nomodel.)

Be it known that I, WILLIAM McOLAvE, a citizen of the United States,residing at Scranton, in the county of Lackawanna and State ofPennsylvania, have invented certain new and useful Improvements inSteam-Jet Blowers for Furnaces; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same. i My invention relates especially to steametting devices forsteam-blowers of the types illustrated in Letters Patents Nos. 281,774and 318,008, granted to me July 24, 1883, and May 19, 1885, or any othertypes of steam-jet blowers whereby jets of steam cause a body of airfrom the outside of the furnace to be drawn 1nto an air duct or tube ofany suitable form, and this air mingled with the steam to be forced intothe furnace through the mass of burning fuel of the fire-bed, therebyfacilitating the combustion of the fuel and producing other beneficialresults.

My improvements will be fully understood from the following description,claims, and accompanying drawings.

Figure l is a perspective View illustrating in ring form my improvedsteam-jetting device for a steam-blower as seen from its forward end.Fig. 2 is also a perspective view of the same as seen from its rear end.Fig. 3 is a vertical longitudinal section of a combined conical andcylindrical air-duct of a furnace with my improved steam-jettingdelivery device for a steam-jet blower applied thereto, the air-ductbeing in section and its connections partly in section and in elevation.Figs. 4, 5, 6, 7, and 8 are sectional or profile views of my improvedsteam-jetting device for a steam-jet blower in the severalcrosssectional forms that it is preferably constructed. Fig. 9 is aperspective view of a portion of the steamjetting device for asteam-blower as formed with an air-cutting ridge and projectingsteam-jet bosses, only one of a series of bosses being shown. Fig. 10 isa diagram illustrating the difference between the action of thesteam-jets upon the air with a ring-jetting device of ordinaryconstruction and a flattened-ring form of jetting device similar to mineshown in Fig. 4 and in other figures of the drawings. Fig. 11 isasection similar to Fig. 3, but showinga single ring-shaped steam-jettingdevice for a steamjet blower and a cylindrical air-duct with anintermediate conical or converged discharging portion. Fig. 12 is a rearend view of a steam-jetting device similar to that shown in Fig. 3, butwith only one connecting-arm between the inner and outer steam-j ettingrings. Fig. 13 is a Vertical cross-section of an airduct and myimprovedsteam-jetting device fora steam-jet blower made in rectangular form, thesteam-jetting device of the blower being divided into numerous smallopen hollow squares; and Fig. 15 is a cross-section of an oblongair-duct and a front elevation of my improved steam-j etting device fora steamjet blower in form ofa long fiat tube with tapered front and rearedges and with projecting steam-jet bosses at its front end.

The main feature of m y invention, as shown in the drawings, is asteam-jetting device A for a steam-jet blower, either of ring or othergeometrical form (but preferably of ring form) made with a flator narrowchamber a for the reception and circulation of the steam, which'entersit from a steam-pipe B, leading from the boiler or other source ofsupply, said fiat or narrow chambered steam-jetting device being formedwith edges 5 b, which, to produce the best results, should be tapered,substantially as illustrated in the drawings, so as to allow the airwhich is drawn into the air-duct O by the jets of steam to pass to thefurnace with the least possible obstruction and diversion from thestraight course.in which it started in entering the air-duct, and thusto insure the closest possible relation of said air to the steam-jetpassages c and to the jets of steam issuing from the said jet-pas. sagesc at the front of the chamber a of the steam-jetting device. Thisdesirable action of the air is illustrated in Fig. 4; of the drawings,wherein the air is shown as being brought in contact with the jets ofsteam almost immediately at the point where the steam is projected fromthe delivery end of the jetting device. Thus controlling the air in itspassage through the duct 0 enables the steam-jets to project the airinto the furnace with its full initial velocity or force from about thetime the steam emerges from the jet-passages until its initial velocityis about fully utilized for projecting, forcing, or drawing air into thefurnace.

The steam jetting device shown in Fig. 6, which in this illustration isof ring form, may in its section from end to end have one side fiat fromits rear to near its front end, and its inner side near its rear end maybe slightly curved; or it may have a slightly convex and concave form,or a reverse curvature may be given to its sides near its rear end, asshown in Fig. 7, so that it shall have a bellshaped mouth, or it may bein form of a double convex lens, as shown in Fig. 8.

It is very important to have the front end of the steam-jetting devicemade with jetpassages of cylindrical bore at and for a sufficientdistance back from their outlet ends to insure the formation ofwell-defined parallel-sided steam-jets before they issue from saidpassages. To this end these passages are made either directly in thesolid V-shaped front end of the steam-jetting device, as shown in Figs.4 and 8, or in spaced bosses d, formed on the tapered solid front end ofthe steam-jetting device, as shown in Figs. 5, 6, 7, and 9, or formed inthe plane or flattened surface of the tapered solid front end of thesaid steam-jetting device, as shown in Figs. 1 and 3, min nipplesscrewed into the tapered solid front end of the etting device.

- It will'be understood that the length of the cylindri'cally-bored orparallel-sided portions of the passages only requires to be sufficientto form the steam into parallel-sided jets before the jets issue fromthe outlets. Therefore if the length of the cylindrical orparallel-sided portions is about equal to the diameter of .the outlets,the desired result-via, the projection of the steam with great velocityand to the greatest possible distance into the air within the casing ofthe blower in order to induct the greatest possible quantity of air bythe friction of the jetswill be accomplished. This proportion may bevaried fromthe minimum given, so as to have the length much greaterthanthe diameter of the outlets.

In the drawings the hollow connectingarms f of the steam-jetting devicefor a steamblower are shown at f as drawn down to nearly a fiat tubularform from a cylindrical tubular form. By this means the connectingarmscan be inserted through the ordinary circular holes of the casingforming the airduct. To effect this the circular parts of the arms aremade of sufficient length beyond the inner surface of the casing formingthe duct to permit the steam-jetting device for the steam-jet blower tobe lowered and raised in said holes of the duct until the connection iseffected and the said device secured centrally in the air-duct. Asusual, one of the arms may have a screw-cap g,on removal of which thesteam-jetting device can be cleaned by blowing out with the steam of theboiler or other source of supply.

In Fig. 12 the single ring shown in Fig. 11 has a central ring Aarranged within it, the same as in Figs. 1, 2, and 3; but the said innerring is connected with the outer ring by a single hollow arm f insteadof by two hollow arms f f, as in said figures, and while this is so theremovable cap g for permitting the steam to be blown through the armsffof the steamjetting device is provided. The construction shown in Figs.14; and 15 is similar in effect to the constructions shown in Figs. 1,2, 3, &c.,

the only difference being in the geometrical construction of theblower-casing and the arrangement of the steam-jets on straight linesand in squares. Inthese views the tapered front and rear ends areretained on' the steam- I jetting devices of the steam-jet blower.

In Fig. 13 the steam-jetting device of the blower is constructed of aseries of radial arms on, united in a hollow hub m, one series of thearms having two steam-jet passages c and the other series a singlejet-passage c. If desired, a single jet nozzle or passage may be appliedcentrally in the closed front end of the hollow hub.

By setting the steam-j et passages in the order shown in Fig. 13 a veryeffective action of the combination of jets for producing a blastisproduced, and by arrangingthe jets in squares and on straight lines, asin Fig. 14, a very effective and powerful blower is obtained.

For light work a blower similar to Fig. 15 will answer a good purpose.It is usual in steam-blowers to either use an air duct in form of asimple truncated cone without the cylindrical extension shown in Fig. 3,or a truncated cone with a cylindrical extension, as O in Fig. 3, or anintermediate conical portion, as in Fig. 11, and sometimes to use asquare or oblong box having parallel sides, as in Figs. 14 and 15, or touse a simple cylinder with parallel sides. .My invention is applicableto all such air-ducts with useful results.

By referring to Fig. 10 it will be seen that in the use of the'ordinaryring-shaped steamjetting device formed of a tube having a steam-chamberof a crosssectional form, which is a true circle, great obstruction tothe passage of the air through the duct is offered; also, that the bodyof air coming in contact with this ring at its rear end and passingalong the inner and outer surfaces of the ring is divided and displacedlaterally in such a manner that it meets the jets of steam at points soremote from the point-s from where they start and receive their initialvelocity or determined lines of projection that a greater part of theireffective power for forcing the air into the furnace is lost, and byreferring to Fig. 4, representing a profile view of a hattened or narrowring-shaped steam-jetting device, it will be seen that this is avoided,as the air comes in contact with the steam almost immediately at thepoints where it receives its initial velocity or determined lines ofprojection.

IIC

chamber on reversely-inolined lines forming its escape-passage thetendency of one portion of the steam passing to said passage is tointerfere with the other portion of steam passing to said passage, andthe consequence isthe destruction of the effective projecting force ofthe steam for drawing in a body of air, the steam soon expanding andforming a cloud, which tends to retard rather than compel the passage ofthe air into the furnace. My invention of having the steam-circulationchamber narrow or flattened and its passages of a determined cylindricalform or with parallel sides and said chamber of considerable length fromthe inside of the steam-chamber of the steam-jetting device to theoutside front delivering end thereof, together with the spacing of thesepassages, renders the employment of the lenticular or flat steamblowerpractical and very beneficial, the use of such blower offering theminimum obstruction to the passage of the air through the airduct andallowing the air to come in immediate contact with the steam-jets,thereby insuring a powerful and effective blast.

It is not absolutely necessary to set the steam-jetting device of theblower into the air-duct, for if it is set a slight distance in rear ofthe same a very effective blast is produced; but while this is soexperience has proved that the best arrangement is to set the blower farenough within the duct to have the initial velocity of the steam carrythe air into the ash-pit of the furnace before the steam-jets break andform an obstructing cloud within the air-duct.

The blower may have one of its connecting arms omitted, and in suchconstruction it can be suspended by a branch pipe of the steamsupplypipe, as in my patent, No. 281,7 74, and when thus arranged a specialblow-out opening can be provided in the blower and closed by a removablescrew-plug.

What I claim as my invention is- 1. A stean1-jetting device for asteam-blower for boiler-furnaces and similar purposes, having a flat ornarrow steam reception or circulation chamber between its rear and frontends and separate steam jet ornipple passages at its front end, saidpassages being cylindrically bored or parallel-sided to a suitableextent, substantially as described.

2. A steam-jetting device for a steam-blower, having a flat or narrowsteam reception or circulation chamber between its front and rear ends,tapered rear and front ends, and separate steam-jet passages or nipplesat its front end, which are cylindrically bored or parallel-sided to asuitable extent, substantially as described.

3. A steam-jetting device for a steam-blower, having a flat or narrowsteam reception or circulation chamber between its front and rear endsand tapered at its front and rear ends and having spaced bosses on itsfront end, said bosses being cylindrically bored to a suitable extent,substantially as described.

4. The flattened or narrowed steam-jetting device having a tapered rearend, separate steam-jet passages or nipples at its front end, and one ormore partly-flat and partly-circle lar connecting ends, in combinationwith the air-duct having circular holes through which said end or endspass, substantially as described.

5. A plurality of flattened or narrow steamjet devices, all incommunication, said devices respectively having tapered rear ends andseparate steam-jet passages or nipples at their front ends, which arecylindrically bored or parallel-sided to a suitable extent,substantially' as described.

6. The flattened steam jetting device having a single taper at its rearend and separate jet passages or nipples at its front end,which arecylindrically bored or parallel-sided to a suitable extent,substantially as described.

7. The flattened steam-jetting device having a single taper at its rearend and a concave and convex or reversed curved form near said rear endand provided with separate jet passages or nipples at its front end,which are cylindrically bored or parallel-sided to a suitable extent,substantially as described.

In testimony whereof I hereunto affix my signature in presence of twowitnesses.

WILLIAM MoOLAVE. \Vitnesses:

E. T. FENWICK, C. SEVERANOE.

